RD Sharma Solutions Class 10 Mathematics Solutions for Probability Exercise 13.1 in Chapter 13 - Probability

Question 72 Probability Exercise 13.1

A bag contains 5 red, 8 white and 7 black balls. A ball is drawn at random from the bag. Find the probability that the drawn ball is neither white nor black.



Events in probability are characterized as certain probable outcomes of an experiment that make up a subset of a finite sample space. Every event will always have a probability of occurrence between 0 and 1.

Total number of possible outcomes = 20 (5 red, 8 white & 7 black}

Let E = Event of getting neither a white nor a black ball

No. of favourable outcomes = 20 – 8 – 7 = 5(total balls – no. of white balls – no. of black balls)

Probability, P(E) = Number of favourable outcomes/ Total number of outcomes

P(E) = 5/20 = 1/4

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